Logician

What are the parameters you're using to Bounce? Maybe you have it set to a low-quality mp3? Try raising the bitrate. Or maybe you have Normalize on and your level is overdriving the headphone? Try turning Normalize off.

Logician

What are the parameters you're using to Bounce? Maybe you have it set to a low-quality mp3? Try raising the bitrate. Or maybe you have Normalize on and your level is overdriving the headphone? Try turning Normalize off.

Logician

After you select Bounce, all the parameters come up in the next window, where you select whether you're bouncing a WAV, AIFF, MP3, and what sampling rate, bitrate, bit-depth, etc. you want to bounce with.
I just re-read your original post, and now I'm wondering whether the problem is just with your mobile's headphones, and not with Logic at all.